Usernames must only contain alphanumeric chars/dashes/underscores
Usernames must only contain alphanumeric chars/dashes/underscores

Perhaps we can relax this a little bit, but right now these are the
only characters that are parsed for @mentions anyway

kidaa/core,kirkbushell/core,dungphanxuan/core,vuthaihoc/core,Onyx47/core,falconchen/core,Luceos/core,utkarshx/core,datitisev/core,flarum/core,renyuneyun/core,huytd/core,kirkbushell/core,zaksoup/core,kirkbushell/core,Luceos/core,datitisev/core,billmn/core,dungphanxuan/core,falconchen/core,vuthaihoc/core,huytd/core,malayladu/core,zaksoup/core,renyuneyun/core,Albert221/core,Albert221/core,billmn/core,malayladu/core,renyuneyun/core,renyuneyun/core,liukaijv/core,liukaijv/core,falconchen/core,Luceos/core,Albert221/core,Onyx47/core,flarum/core,datitisev/core,kidaa/core,flarum/core,billmn/core,zaksoup/core,vuthaihoc/core,datitisev/core,kidaa/core,jubianchi/core,Onyx47/core,kirkbushell/core,dungphanxuan/core,Luceos/core,jubianchi/core,Albert221/core,malayladu/core,utkarshx/core,malayladu/core